An improved interface control advantageously may be operated by one hand. In particular, the output unit is a binary output unit of a safety-oriented programmable logic controller, which controls actuators of an external technical process. The implant has two body members with a space therebetween so the implant may be then distracted and a spacer of predetermined thickness that may be inserted within the space between the body members so as to maintain a desired amount of distraction. One of the current collectors is connected to the positive electrode and the other to the negative electrode.